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(No Model.) 3 SheetsSheet 1 WIS. POST & H. DE W. SAWYER.

STEAM BOILER AND FURNACE.

No. 394,131. Patented Dec. 4, 1888..

\WITNEEJEIEEI (No Model.) 3 Sheets-8heet 2.

W. S. POST & H. DEW. SAWYER.

STEAM BOILER AND FURNACE.

180.894.1551. Patented Dec. 4, 1888.

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'WFS. POST 82 H. DE W. SAWYER.

STEAM BOILER AND FURNACE.

No. 394,131. PatentedDec. 4, 1888.

'lYlllLlAlil POST, OF BOSTON,

lllASSr-iflll SETTS, ASSIGL'ORS AND HOVART) DE \V. S. \\\'\'l ll (1F REVERE, TO THE COMPLETE (OMBlS'llHX (UMPANY 'OF PORTLAND, MAINE, OF BOSTON, MASSACHFSE'ITS.

ST EAiW-BOlLER AN D FU RNACE.

SPECIFICATION forming part. of Letters Patent No. 394,131, dated December 4, 1888.

Application filed January 3, 1888.

Serial No. 259,661. (No model.)

To all whom it may concern:

Be it known that we, \VILLIAM S. POST, of Boston, and HOWARD DE W.SAWYER, of Revere, both in the county of buttolk and State 5 of Massachusetts, have jointly invented certain new and useful Improvements in Steam- Boilers and Furnaces, of which the t'ollow In each ot' our prior forms of apparatus a.

downward draft was maintained through an oblique water-grate, the caloric current being deflected and caused to pass downwardly bel low and behind a depending water-leg having an oblique portion about parallel with the grate, upon which the descending current impinged.

With our present improvements we employ the oblique water-grate and downward draft, substituting for the depending leg, with its oblique member, a plain vertical water-back, along which the caloric current is deflected to a point considerably below the grate, pass ing meanwhile between water-circu1ating tubes, said water-back having lengthwise through it a series of vertical lines, through which the caloric current passes upwardly to the funnel. The water-back of our present boiler forms a part of or is connected directly with the water-wall at the backand each side of the fire-box. The pipes of the water-grate run obliquely downward and c'water-circulating pipes below the grate run obliquely up 40 ward from the water-back to an independent water-box placed across the front of the boiler and disconnected from the water-wall thereof. This box may therefore yield with the expansion and contraction of said pipes, and

4.5 all may be introduced together into place through the bottom of the boiler.

in the drawings, Figure 1 is a vertical section from front to rear of an upright boiler embodying our improvements. Fig. :2 is a are consumed.

horizontal section on line .r .r of Fig. .1. Figs. 5o 3 and 5 are vertical sections on line 1 z of Fig. 1, looking, respectively, to front and to rear thereof, but showing a boiler open at bottom. Figs. 4- and ti show details oi the water-box and its connected tubes, Fig. l1 representing a sectional box.

A is the outer shell of the boiler, preferably of the D form in cross-section shown in the drawings. The tire-box B is placed wholly within this shell, and is divided by the grate into two chambers and D, the upper one, t, being the fuel-chamber and the lower one the combuslion chamber, in which the gases The tire-box is entirely su1= rounded by water when in use, except at the bottom, the space between it and the outer shell forming water-walls E at each side and in front and rear oi? the fire-box, while the water-line is maintained constantly at a suil able height above the crown-sheet, as shown. The bottom of the boiler may also be "t waterspace, as shown in Fig. 1. A door, 1. above the grate admits fuel, and a dampeigf, therein constitutes a (.lrat't-opening for the downward air-current, while below it is another door, G, for removal of ashes. 'lhebottom of the boiler may be left open for convenience in setting the tubes or for repairs, as in Figs. 3 and 5,-andthe structure rests on a tire-brick foundation.

In rear of the firebox is watenback P, constituting a material enlargement of the wat er-wall, with which it is directly connect ed. 'lhrough thewater-back vertically there is a series of lines, .1, for the upward passage of the caloric current, which is first deflected downwardly by the front wall of the waterback and enters said lines through the bottom thereof, which is raised a foot or more above the bottom of the combustion-chamber for this purpose.

'lhe grate K, upon which the fuel rests, consists of a series of metallic tubes, preferably about one inch in diameter and from onehalt'to three-fourths of an inch apart, set par- 5 allel to each other and at an inclination of' about one inch per linear foot. Below the grate is another series of water-pipes, L.

shown aslarger in diameter and less in number, inclined in the opposite direction, for the purpose of supplying water to and maintaining its circulation through the grate. All the tubesK and L extend from the water-back II forward to and into an independent pipe or water-box, M, placed horizontally, across the front part of the firebox, but detached therefrom, so that it may yield with the tubes under the varying temperatures. The supplypipes L thus serve, also, as braces to support the free end of the grate and the fuel upon The water-box M may be made in sections, as in Fig. 6, a single pipe L supplying water for two or more grate-tubes, K.

There are other advantages of 1 ur combinations of the grate and supply-pipes with the water-box LI. Said pipes are at first screwed sufficiently far intothe box so that all may be introduced together through the open bottom of the boiler, and when in position the tubes maybe successively unscrewed from the box far enough to enter at the other end through the front of the water-back and each be thus made fast. (ouiitersunk setnuts N, with fire-proof packing, are then.employed to secure tight joints By making the box M in etions the tubes connected with any one section may be readily removed together for cpairs, it required, without disturbing the" rtanainder oi the grate.

The downward drai't causes the gases evolved to pass through the tire, carries the caloric current between the tubes of the grate K, impinging upon and passing between the inclined water-circnlating pipes I), and produces in the combustion-cliamber (l a most intense heat, to which the water is continually exposed, thus utilizing the. heat to the utmost and generating steam with great rapidity. For more complete comb ustion of the gases we arrange to deliver a limited and regulated amount of air iu jets below the grate. Au air-pipe, P, runs through the toot of the water-back and has short hollow nipples Q, connecting its interior with that of the combustion-chamber, as indicated in Figs. 1 and 5, and about as shown in our former patent, Nt 351,652.-

Above the fines J we provide a removable cap or hood, R, so that ready access to said flues may be had forthe purpose of cleaning them when required.' A steam-pipe, S, and water-inlet WV will' be furnished with suitable gages, valves, the. The boiler will be suitably supported by ordinary crown-bars and stay-bolts, so as to have abundant strength.

'0 claim as our joint invention- 1. In adowndra'jt steamgenerator, the fuelchamber C, closed tightly at top and provided with a feed-door and draftinlet above the grate, and the combustion-ehamber I) below the grate, extending beneath the waterbaek, with the outlet for the caloric current through the fines .T, in cmnb-ination with the water-back ll, traversed. by said fines, and with the water-grate K, having a frontwaterconnection and connected with said waterhack, substantialtv as set forth. 7

2. In a steam-gellerator, the shell A, tire-pot ll, and deflecting water-lmck ll, having vertical tines J traversing it, in combination with an inclined water-grate, K, and a series of water-oirculating pipes, l below said grate, adapted to supply water thereto, tor the purpose set t'orth.

3. In a stcanrgenorator, the tire-pot 1;,havthe oblique water-grate h, separating the fuelchamber from the combustion-chainber, in

combination with the imlepeiulent water-box- M and the \\'atei '-c.irculating pipes L,'l'lll'0llgll which water is supplied to said grate, substantially as set. forth.

4.- in a steamgenerator, the combination of the water-back II and independent water-box M with the \\-'ater-grate K and oblique eirculating-pipes L, arranged to act as inclined supports for the water-box, said tubulargrate and pipes both connecting with the water-baek and water-box. to complete a direct circulation, substantially as set forth. 4

In testimony whereof we have signed our names to this specification, in the 1.)resence of .two subscribing witnesses, on this 34th day of December, A. l). 1387.

WILLIAM 8. POST. HOWARD DE \V. SAlVYER.

Witnesses:

A. ll. SPENCER, FRANK T. BENNER. 

